The point I was trying to make is that Amazon owns Mobipocket and I already have mobipocket versions of their ebooks that I bought in the past, and I can't see having to pay twice for the same book just because Amazon twists the DRM code so one version works on the Kindle and the other doesn't.

It's a valid point. Before purchasing a Kindle, I had many books in Mobi format previously purchased for other devices (not to mention PDB files going back to Peanut Press). Scripts for stripping DRM were available and I took advantage of them -- otherwise I wouldn't have purchased a Kindle.